i know there's a lot of complicated science but can you break it down and explain how it works. >> this is pretty incredible. using a patient's own immune system to fight cancer. take a look at this animation. they had five patients with untreatable cancer. they used a virus to inject genetic material into a patient's own white cells to turn them into cancer fighters. those then went out in the body and destroyed all the cancer cells. these patients, they all went into remission. three of them had bone marrow transplants and are doing great. >> we didn't realize one of the patients, our own david aponte, our sound man, we spent time with him and it's incredible. >> yeah, i spoke with david the other day, and, you know, he credits this with saving his life. last summer he had had lots of chemotherapy. he thought he was in remission and his cancer bounced back. there was nothing left for him to do. he had this treatment. they injected the cells. overwhelming reaction in his body, eight days later not one cancer cell could be found. he has had a bone marrow transplant. he's doing well. you